What is cryptocurrency? By Cara McGoogan & Matthew Field

Cryptocurrency is a form of digital money that is designed to be secure and, in many cases, anonymous. It is a currency associated with the internet that uses cryptography, the process of converting legible information into an almost uncrackable code, to track purchases and transfers.
Cryptography was born out of the need for secure communication in the Second World War. It has evolved in the digital era with elements of mathematical theory and computer science to become a way to secure communications, information and money online.

The first cryptocurrency was bitcoin, which was created in 2009 and is still the best known. There has been a proliferation of cryptocurrencies in the past decade and there are now more than 1,000 available on the internet. Bitcoin soared as high as $20,000 at the end of last year before crashing back to less than $8000 now. 

How do cryptocurrencies work? 
Cryptocurrencies use decentralised technology to let users make secure payments and store money without the need to use their name or go through a bank. They run on a distributed public ledger called blockchain, which is a record of all transactions updated and held by currency holders.

What are the most common cryptocurrencies?
Bitcoin: Bitcoin was the first and is the most commonly traded cryptocurrency to date.  The currency was developed by Satoshi Nakamoto in 2009, a mysterious figure who developed its blockchain. It has a market capitalisation of around $230 billion as of December 2017.

Ethereum: Developed in 2015, ether is the currency token used in the ethereum blockchain, the second most popular and valuable cryptocurrency. Ether has a market capitalisation of around $67 billion as of December 2017. However, ether has had a turbulent journey. After a major hack in 2016 it split into two currencies, while its value has in recent months reached as high as $840 but it has previously crashed briefly to as low as 10 cents. It has proved hugely popular as a launch pad for other cryptocurrencies in 2017, which use the ethereum blockchain's code.

Ripple: Ripple is another distributed ledger system that was founded in 2012. Ripple can be used to track more kinds of transactions, not just of the cryptocurrency. It has been used by banks including Santander and UBS and has a market capitalisation of around $10 billion.

Litecoin: This currency is most similar in form to bitcoin, but has moved more quickly to develop new innovations, including faster payments and processes to allow many more transactions. The total value of all Litecoin is around $5 billion.

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